DSP56364D Motorola Inc, DSP56364D Datasheet - Page 43
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DSP56364D
Manufacturer Part Number
DSP56364D
Description
24-Bit Audio Digital Signal Processor
Manufacturer
Motorola Inc
Datasheet
1.DSP56364D.pdf
(162 pages)
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Notes:
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MOTOROLA
Table 2-9 DRAM Page Mode Timings, One Wait State (Low-Power Applications)
WR deassertion to CAS asser-
tion
CAS deassertion to WR asser-
tion
CAS assertion to WR deasser-
tion
WR assertion pulse widt
Last WR assertion to RAS
deassertion
WR assertion to CAS deasser-
tion
Data valid to CAS assertion
(Write)
CAS assertion to data not valid
(write)
WR assertion to CAS asser-
tion
Last RD assertion to RAS
deassertion
RD assertion to data valid
RD deassertion to data not
valid
WR assertion to data active
WR deassertion to data high
impedance
1.
2.
3.
4.
5.
6.
The number of wait states for Page mode access is specified in the DCR.
The refresh period is specified in the DCR.
All the timings are calculated for the worst case. Some of the timings are better for specific cases (e.g., t
equals 2
BRW[1:0] (DRAM control register bits) defines the number of wait states that should be inserted in each
DRAM out-of-page access.
RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is t
Reduced DSP clock speed allows use of Page Mode DRAM with one Wait state (See
5
Characteristics
T
C
for read-after-read or write-after-write sequences).
Freescale Semiconductor, Inc.
h
For More Information On This Product,
DSP56364 Advance Information
Symbol
Go to: www.freescale.com
t
t
t
t
t
t
t
WCH
t
WCS
RCS
RCH
RWL
CWL
t
ROH
t
t
t
WP
DS
DH
GA
GZ
0.75
0.25
1.75
1.75
0.25
0.75
0.75
0.5
1.5
1.5
Expression
0.25
T
T
C
C
T
T
T
External Memory Expansion Port (Port A)
T
T
T
T
T
T
T
C
C
C
C
C
C
C
C
C
C
4.3
7.5
T
C
4.2
4.5
4.0
3.8
3.7
4.3
4.3
4.0
4.0
0.3
33.7
20.8
70.5
83.2
83.2
33.5
45.7
71.0
37.2
Min
8.8
8.5
0.0
—
—
20 MHz
Max
42.5
12.5
—
—
—
—
—
—
—
—
—
—
—
—
6
21.2
12.5
45.5
54.0
54.0
21.0
29.0
46.0
24.7
Min
4.6
4.3
0.0
—
—
30 MHz
Figure 2-14
Specifications
OFF
Max
25.8
8.3
—
—
—
—
—
—
—
—
—
—
—
—
6
and not t
1, 2, 3
.).
2-23
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
GZ
PC
.
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